Openstack Networking Design
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- Ezra Gaines
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1 Openstack Networking Design Pete Lumbis CCIE #28677, CCDE 2012::3 Cumulus Networks Technical Marketing Engineer 1
2 Openstack Overview Takes a pool of servers Deploys s (OS, disk, memory, CPU cores, etc) Attaches to networks Resource management Microservice style. Each thing is a stand alone component Openstack Projects (i.e., Neutron, Nova, Cinder, etc) Why Openstack is seen as complex Networking vs Compute vs Storage vs GUI Work via APIs, not tightly coupled 2
3 Openstack Nova Compute Services Deploys s Manages CPU, memory, disk size are servers that can run s 3
4 Openstack Neutron Networking Services Manages list of tenant networks Tenant = VLAN/VxLAN Assigns tenant network to Programs network stack on based on user config (Optional) ML2 Driver: Neutron server to switch API Switch runs the driver to translate Openstack API to local config/state Neutron focus is layer 2. L3 generally done on server software L3 gateway, NAT, ACLs done on a centralized Neutron x86 Node DVR (Distributed vrouter) allows for L3 on Local Compute Node (Nova) 4
5 Relevant Components Controller Nodes (Global Openstack Manager) Neutron Nodes 5
6 Relevant Components 1 Controller Nodes (Global Openstack Manager) 1 User requests a new, supplying parameters like amount of RAM and the network (vlan/l2 segment) they want to be on Neutron Nodes 6
7 Relevant Components Controller Nodes (Global Openstack Manager) 1 2 User requests a new, supplying parameters like amount of RAM and the network (vlan/l2 segment) they want to be on Openstack Controller magically selects a Nova Node to deploy the on. 2 Neutron Nodes 7
8 Relevant Components Controller Nodes (Global Openstack Manager) 1 2 User requests a new, supplying parameters like amount of RAM and the network (vlan/l2 segment) they want to be on Openstack Controller magically selects a Nova Node to deploy the on Neutron Nodes Simultaneously Openstack Controller tells Neutron Node about a new, the Nova node and desired VLAN 8
9 Relevant Components Controller Nodes (Global Openstack Manager) 1 2 User requests a new, supplying parameters like amount of RAM and the network (vlan/l2 segment) they want to be on Openstack Controller magically selects a Nova Node to deploy the on.????? 3 Neutron Nodes 2 3 Simultaneously Openstack Controller tells Neutron Node about a new, the Nova node and desired VLAN Neutron decides if the network already exists. If no, a new L3 gateway is created on the Neutron Node. 9
10 Relevant Components Controller Nodes (Global Openstack Manager) 1 User requests a new, supplying parameters like amount of RAM and the network (vlan/l2 segment) they want to be on 2 Openstack Controller magically selects a Nova Node to deploy the on. 4 Neutron Nodes Simultaneously Openstack Controller tells Neutron Node about a new, the Nova node and desired VLAN Neutron decides if the network already exists. If no, a new L3 gateway is created on the Neutron Node. Neutron builds L2 config on the Nova device 10
11 Relevant Components Controller Nodes (Global Openstack Manager) 1 User requests a new, supplying parameters like amount of RAM and the network (vlan/l2 segment) they want to be on ML2 2 Openstack Controller magically selects a Nova Node to deploy the on. 5 Neutron Nodes Simultaneously Openstack Controller tells Neutron Node about a new, the Nova node and desired VLAN Neutron decides if the network already exists. If no, a new L3 gateway is created on the Neutron Node. Neutron builds L2 config on the Nova device 5 If deployed to do so, Neutron will speak, via the ML2 Driver, to a hardware switch to provision a VLAN or VxLAN (along with or instead of step 4) 11
12 Relevant Components 6 ML2 Controller Nodes (Global Openstack Manager) 1 2 User requests a new, supplying parameters like amount of RAM and the network (vlan/l2 segment) they want to be on Openstack Controller magically selects a Nova Node to deploy the on. Neutron Nodes Simultaneously Openstack Controller tells Neutron Node about a new, the Nova node and desired VLAN Neutron decides if the network already exists. If no, a new L3 gateway is created on the Neutron Node. Neutron builds L2 config on the Nova device 5 6 If deployed to do so, Neutron will speak, via the ML2 Driver, to a hardware switch to provision a VLAN or VxLAN (along with or instead of step 4) Local ML2 plugin translates OpenStack config into device specific config 12
13 Openstack Network Design Options VLANs Most common Most fragile EVPN-VxLAN Network centric Scalable, resilient VxLAN on Servers Most scalable Simplest network More complex servers 13
14 Openstack Networking: Preprovisioned VLANs Network trunks all VLANs Neutron Node 14
15 Openstack Networking: Preprovisioned VLANs Network trunks all VLANs Servers may trunk all VLANs Neutron Node 15
16 Openstack Networking: Preprovisioned VLANs Network trunks all VLANs Servers may trunk all VLANs Neutron Node New server creation only links physical trunk to 16
17 Openstack Networking: Preprovisioned VLANs 17
18 Openstack Networking: Preprovisioned VLANs Pros: Easiest deployment Physical network is static No ML2 Neutron Node Cons: Limited scale Very large blast radius 18
19 Variation on a Theme: ML2 Provisioned VLANs Nothing pre-configured Empty trunks on network and compute ML2 Agent running on all switches Including Core/Spines ML2 ML2 19
20 Variation on a Theme: ML2 Provisioned VLANs Neutron provisions VLANs on switches via ML2 agent Neutron Node ML2 ML2 20
21 Variation on a Theme: ML2 Provisioned VLANs Neutron provisions VLANs on switches via ML2 agent ML2 Agent provisions switch VLANs ML2 Neutron Node ML2 21
22 Variation on a Theme: ML2 Provisioned VLANs Pros: Simple server networking Slightly more scalable* Cons: Requires ML2 on switches Still limited by L2 scale Likely to still have large blast radius as environment grows ML2 Neutron Node ML2 22
23 Sidebar: Openstack Agents and ML2 on Switches Openstack is designed for clouds Everything is ephemeral It can die at any time and no one should care This includes networking No one actually accepts this fact There may be no config for ML2 state A reloaded switch may lose all provisioned state Depends on vendor implementation Lost state requires all rack s to be destroyed and recreated 23
24 Sidebar: Openstack Agents and ML2 on Switches 24
25 VxLAN-EVPN for Better L2 VxLAN provides L2 over L3 EVPN provides VxLAN control plane (Where MACs live) EVPN EVPN configured from TOR to TOR Pre-Provision VxLAN Tunnels Scale improvement since MACs are not pushed local a host exists Openstack doesn t care about EVPN 25
26 VxLAN-EVPN for Better L2 Neutron provisions VLAN on host Neutron Node 26
27 VxLAN-EVPN for Better L2 Neutron provisions VLAN on host Neuron also provisions VLAN on network via ML2 Switch pre-provisioning maps VLAN to VxLAN ML2 Neutron Node ML2 27
28 VxLAN-EVPN for Better L2 Alternative deployment: Pre provision switch VLANs Neutron only deploys server VLANs Neutron Node 28
29 Server Networking: Pre-provisioned EVPN Pros: Allows for L3 underlay Easily scales tenants Preprovisioning is easy Cons: May require ML2 on switches Network still involved ML2 Neutron Node ML2 29
30 Server Networking: Pre-provisioned EVPN 30
31 Scalable Openstack: Server based VxLAN Host connects to TOR on routed port Host runs Free Range Routing (FOSS routing suite) ebgp (L3 Fabric) Host and TOR run ebgp unnumbered Dual attach does not require mlag Server advertises /32 loopback into the network No relationship between Openstack and BGP FRR FRR 31
32 Scalable Openstack: Server based VxLAN Neutron programs VxLAN tunnel from host to host Server loopback interface is the Tunnel Endpoint (VTEP) Host only sends encapsulated VxLAN traffic into the network Switches only do basic L3 routing vxlan Neutron Node Openstack links VxLAN to still only has normal ethernet, no based VxLAN or VLAN tag 32
33 Scalable Openstack: Server based VxLAN Pros: Operationally easy, no mlag Plug and play servers, no IPAM 0 packet loss network changes Extremely scalable vxlan Neutron Node Cons: CPU performance hit if NICs don t support VxLAN Requires FRR on servers Ironic still requires ML2 33
34 What Should I Do? 34
35 What Should I Do? How many tenants? 1-50: L2 everywhere, pre-provisioned will be easiest : consider pre-provisioning VxLAN-EVPN >1000: dynamic (ML2, server VxLAN) options are required to scale Do you want the network to be programmed by Openstack? Yes: ML2 is acceptable No: Pre-provision or use server-server VxLAN VLANs or VxLANs? Always prefer VxLANs Network hardware needs VxLAN support Server NICs need VxLAN offload 35
36 A Final Note about L3 All this is about L2 connectivity L3 is a different plugin (Layer 3 Plugin) Less network vendor support for L3 vs L2 plugin L3 usually requires NAT Most Network Hardware L3 plugins don t support NAT functionality Other services often required (FWaaS, LBaaS) Easy to scale out with FRR on hosts 36
37 Thank you! Visit us at cumulusnetworks.com or follow 2018 Cumulus Networks. Cumulus Networks, the Cumulus Networks Logo, and Cumulus Linux are trademarks or registered trademarks of Cumulus Networks, Inc. or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners. The registered trademark Linux is used pursuant to a sublicense from LMI, the exclusive licensee of Linus Torvalds, owner of the mark on a world-wide basis. 37
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